Laminated transformer-core.



0. WIEMER.

LAMINATED TRANSFORMER GORE.

APPLICATION rum) my 17,1909.

Patented Sept. 20.19.10.

Fig.6.

Fig.5.

UNITED STATES PATENT OFFICE.

QTTO WIEMER, OF ST. LOUIS, MISSOURI, ASSIGNOR T0 WAGNER ELECTRIC MANU= FACTURING COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

LAMINATED TRANSFORMER-CORE.

Specification of Letters Patent.

Patented Sept. 20, 1910.

To all whom it may concern:

Be it known that I, OTTO VVIEMER, a citizen of the United States, residing at St. Louis, in the State of Missouri, have invented a certain new and useful Laminated Transformer-Core, of which the follow is such a full, clear, and exact description as will enable any one skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

The object of my invention is to provide plates for forming laminated transformer cores, which may be easily assembled and which will require clamping in only two directions.

Another object is to provide .plates that may be stamped in such a manner that no material will be wasted and at the same time enable a joint to be formed which will afford the least magnetic resistance possible.

My invention consists of the novel features hereinafter described and pointed outin the claims annexed hereto.

In the accompanying drawings which illustrate my invention, Figures 1 and 2 show alternate elements of a core partially assembled. Fig. 3 shows a core partially assembled toreceive the coils. Fig. 4 shows a core completely assembled. Figs. 5 and 6 show lines along which the material is punched or sheared. It is also apparent from these figures that the shape of various pieces of metal used is such that no material is wasted.

Like marks of reference refer to similar parts in the several drawings.

8 is a strip of magnetic metal stamped from a sheet as shown in Fig. 5 and forms one-"of the yoke segments of the core.

7 is a strip of the same material cut out as shown in Fig. 6 and forming one of the cross piece elements of the core. These strips may, of course, be cut out in any desired manner but I prefer to use a punch and die for cutting along lines 9 and a shear along lines 10. As shown in the drawings the ends of these cross pieces 7 are shaped to conform to the parts of the yoke segments against which they abut. The edges forming the joints of each element are at angles of substantially 90 to each other, thus producing a joint of high magnetic permeability.

As will be apparent, my novel core is very easily assembled. For form wound coils the core can be first partially assembled in the form of an E for the shell type, or in the form of a U for the core type construction. The coils can then be slipped in place and the assembling of the yoke can be completed. In assembling the core the alternate elements are reversed as shown in Fig. 3, thus throwing the joints out'of register and securing a rigid construction. Breaking the joints in this manner also improves the magnetic circuit.

My method of forming and assembling the core elements makes itnecessary to clamp the assembled core in only two directions, first perpendicularly to the plane of laminations and second in the direction of the axis of the coils. It is then impossible for the segments to shift in any direction and pressure is exerted in such a way as to make the joints fit as closely as possible.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. An element for a laminated transformer core composed of separately formed cross-pieces the end edges of which are broken lines, and yoke segments adapted to register wit-h the ends of the cross-pieces.

2. An element for a laminated transformer core composed of separately formed cross-pieces the end edges of which are broken lines whose contiguous parts lie at angles of substantially 90 to each other, and yoke segments adapted to register with the ends of the cross-pieces.

3. A laminated transformer core composed of elements each of which is made up of separately formed cross-pieces the end edges of which are broken lines, and yoke segmentsadapted to register with the ends of the cross-pieces, said elements being alternately reversed in assembling in order to break the joints.

In testimony whereof, I have hereunto set my hand and aflixed my seal in the presence of the two subscribing witnesses.

OTTO WIEMER. in. s}

Witnesses:

O. B. BENNETT, M. L. FRANKLIN. 

